A strong combination tool, unique in its kind. Creates a FROMM MicroLock ™ sealless closure, eliminating so-called unlocking. The free-running tensioning system prevents loss of belt tension. Adjustment of the cutting and sealing depth, as well as maintenance, are easy to perform.

    Strap qualities
  • Uniflex up to 850 N/mm2
    Ultraflex up to 1100 N/mm2
    Strap dimensions
  • 9.5 - 20.0 x 0.38 - 0.63
    3/8" - 3/4 x .015 - .025"
  • 4.5 kg / 9.8 lbs
    4.7 kg / 10.4 lbs (TW version)
Unsurpassed Quality
Advanced Design
Extremely Durable


with MicroLock™ safety joint
An ideal tool for a wide range of vertical and horizontal strapping applications for flat goods in almost all industries. The unique innovative punching of the sealless MicroLock™ joint guarantees even greater safety. Opening and closing by the recoil effect is rendered impossible. The MicroLock™ seal is very popular for strapping packages which for instance are subject to shrinkage due to drying out.


  • The MicroLock™ sealless system guarantees a maximum of security of the sealless steel strapping joint against unlocking
  • The tool can handle regular duty and high tensile steel strapping
  • The tool can handle steel strapping up to a thickness of 0.64 mm / .025″
  • Thanks to the special tensioning system (free wheeling) no loss of strap tension
  • The sealing mechanism is completely closed
  • The adjustment of the cutting and sealing depth is simple
  • The feed wheel and the die and cutter support are easy to change


The table below gives you all key factors of this very reliable and durable device that gives everyone who works with it a secure and familiar feeling.

Strapping QualitiesUniflex and Ultraflex max. 1100 N/mm2, 160'000 psi
Strapping Dimensionswidth 9.5 – 20.0 mm / thickness 0.38 – 0.63 mm
Weight4.45 kg, 9.8 lbs Normal version / 4.7 kg, 10.4 lbs TW version
Average seal strengthapprox. 80%
Sealless jointFromm MicroLock TM
Suspension (Optional)Suspension for vertical and horizontal applications (has to be ordered separately)


Pictures say more than a thousand words. Download one of our videos and let yourself be convinced of the ease of use and reliability of the device and the end result = good and reliable strapping that allows your product to be transported safely.


If you want to orient yourself further, we invite you to download one or more copies of the current product information here. You can of course also choose to ask your information request via the contact information form.

Datasheet A337

Product datasheet


In addition to the conventional systems for steel strapping, FROMM has developed equipment for polyester strapping. This new type of strapping is flexible, absorbing shock impact during shipping, loading and unloading more effectively than steel strapping. The range is divided in pneumatic, manual and… Read more electric tools. Electric tools allow an independent working range, ideal for applications requesting not only flexible handling of the tool but also high tension of the strap.

Plastic Strapping Tools


Please complete the contact request on the right so we can ensure that we can deliver all the information you are looking for quickly. You will be contacted by the appropriate FROMM office in your area.

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